What does the error message "Illegal base64 character 22" regarding token decoding signify?

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The error message "Illegal base64 character 22" regarding token decoding signifies that there is an invalid character in the base64-encoded token string. Base64 is a way of encoding binary data in ASCII text format, and any invalid characters in the encoded string can cause decoding errors. In this case, the character 22 is not a valid base64 character and needs to be removed or replaced with a valid character to successfully decode the token.